It’s also tricky to adjust gears because they behave differently under pressure. Gears that feel perfect when you’re trying them out in the garage can be disappointing when you try them out for real. Occasionally, the opposite situation occurs: you can’t get the gears to shift properly at all in the shop, then you go for a ride anyway and unexpectedly they feel fine.
Adjust cable tension
If you’re unhappy with the shifting, the most sensible place to start is with the cable tension adjustment. Click the shifters all the way into their neutral position (high gears for standard derailleurs, low for rapid rise) and then shift over into the neighbouring sprocket. If the chain doesn’t sit vertically under the sprocket or doesn’t shift crisply, you have an adjustment problem…
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Bike Maintenance Tips, Tricks & Techniques (Digital) - 1 Issue, Bike Maintenance Tips, Tricks & Techniques 3rd Edition